Art of filtration



Mar. 3, 1925. 1,528,427

" E. M. CLARK ET AL ART OF FILTRATION Filed Dec. 22, 1920 2 Sheets-Sheet l Mar. 3, 1925. 1,528,427

E. M. CLARKI ET AL ART OF FILTRATION Filed Deo. 22, 1920 2 Sheets-Sheet 2 Patented Mar. 3, 1925.

UNITED STATES rATENT oFFlcE.

' nDcfAn` or NEW Yonx, N. r., AND FRANK A. HOWARD, or ELIZABETH,

NEW JEBISEY, ASSIGNOBS TO STANDARD DEVELOPMENT COMPANY, ACOBCPORA- f TION OF DELAWARE.

f Azar or FILTRATION.

Application med December 22, 1920. Serial No. 432,582.

To all 'whom iz;V lmay concern.'

Be it known that we, EDGAR M. CLARK and FRANK A. HOWARD, citizens of the United States, residing at New York, in the county ofNeW York and State of New York, and Elizabeth, in the `county of Union and State of New Jersey, respectively, have invented a new and useful Improvement in the Art of Filtration. of which the following is a specification. c

The present invention relates to the art of filtering and more particularly to the filtration of parafiine wax from chilled hydrocarbon oil. It will be clearly understood from the following description, illustrated by the accompanying drawing, in which:

= Fig. 1 is a broken side elevation of a press suitable for carrying out the presentvmvention, the cover therefor being shown in section;

Fig. 2 is a transverse sectional view onthe line 2 of Fig. l, and

Fig. 3 is an enlarged sectional view o f the end portion of the press into which oil is fed, the longitudinal dimensions being on a lar er scale than the vertical dimensions.

Re erring more particularly to the drawings, the numerals 5, 5 indicate longitudinal supporting rods, mounted at one end upon a suitable standard 6 and at the other end upon a similar standard, (not shown). The numeral 7 indicates a stationary head or end member which is adapted to abut against the standard 6, and the numeral 8 indicates a movable head or end member at the oping and with substantially diametrically ex tending arms 11a which rest upon the supporting bars 5 and serve to support the filter member as a whole. On each sideof the plate 10 is positioned a circular wire cloth or screen 11a and the edges of the 'filter disk are thickened' by the imperforate rings 12 secured to the lter member outside of the wire cloths 11, 11. A filter cloth 12 of duck, canvas or other suitable material is placed on each side of the entire filter member, each cloth being provided with a central opening somewhat smaller than the central opening in the plate member 10. The filter cloths on each side of each plate are sewed together tightly within the center opening f the plate, as at 13, and they are sewed together loosely or at intervals around the circumference of the plate, as at 14, 14:. The adjacent filter members are of the same size, and when placed in order upy i press is cold, the chilled oil to be filtered is introduced into the pressthrough the pipe 16. It enters the space 15l in the end member 8V and fromthere passes through the central openings of the filter members to completely fill the spaces in,the press between the filter members generally called the wax spaces. It is forced under pressure through the filter cloths, the interposition of the screen members between the rings permitting the filtered oil to drip out of the press. The wax contained in the oil is left upon the surfaces of the filter cloths. lVhen the wax spaces of the press have been substantially filled with wax, the supply of I oil thereto is stopped.

In order to remove the wax from the press, slack wax, as taken directly from the filter press, is heated to a temperature of 180 F. or above, preferably about 200 F. This heated slack wax' is then forced into the press through the opening 16 into which 'the chilled oil was previously passed. At

the same time, if desired or found advisable to aid in heating the body of metal of the press, hot slack wax may likewise be rained upon the press from the longitudinally extending spray pipe 17", Aextending the full length of the press, and suspended from suitable supports l18. The hot slack wax, together wlth the melted wax from the interior of the press, pass through the filter cloths and drip from the press and are eollected separately from the filtered oil. It is likewise found desirable to provide a cover, for example, of canvas, .which is disposed-to cover the press and the hot wax distributing pipe 17 while the latter is used to spray hot wax upon the press. Such a cover is sho-Wn in the drawings, being indicated by the numeral 19, the longitudinal rods 20 suspended by means of suitable hangers 21, 21 serving as a support for said cover.

After removal of the wax from the press,

'it is necessary t-o chill the latter before proper filtration of oil can be effected. This chilling may be accomplished by forcing either cold pressed oil or Wax-bearing oil through the press. If the latter is used, it may be separately collected, again chilled and passed through the press.

Although the present invention has been described in connection with the details of the specific means for carrying it out, it is not intended that these details shall be regarded as limitations upon the scope of the invention, except in so far as included in the accompanying claims.

We claim:

1. In the art of filtering Wax from chilled oil, the improvement which consists in applying heated slack Wax to the filtered Wax,

thereby melting the latter, and removing the melted wax.

thereby melting the Wax in the press and 'forcing the Wax from the press.

4. The method of removing Wax lfrom a filter press filled with wax which consists in forcing heated slack wax into the press, thereby melting the wax in the press and forcing it out of the latter and simultaneously applying a heating fluid to the exterior of the press.

5. The method of removing Wax from a filter press filled with Wax which consists in forcing heated slack wax into the press, thereby melting the Wax in the press and forcing it out of the latter and simultaneously applying heated slack Wax to the exterior of the press. i i

6. ln combination, a wax filter press, a spray pipe above the press and means for supply-ing a lheated iquid to said pipe whereby the heating liquid is applied to the exterior of the ress.

l`RANK A. HOWARD.

EDGAR M. CLARK. 

